I put a stout set of heavy steel bumpers on both ends of my truck about a year and a half ago. I have the "snow plow prep pkg. " front springs on mine so it sat almost level prior to installing the bumpers. Just for kicks, I installed a set of "leveling spacers" up front when I put on the bumpers. The truck sits perfect now with the complete package installed. My front end is notably heavier with the bumper and 12,000 Warn winch installed; but the ride has not suffered any. I might have lost some fuel efficiancy when running down the highway though.
The one thing I can say is that the truck is more protected now at both ends and will withstand a fair impact without damage. I like the comfort of knowing that a deer or the like will not disable my truck as likely on a dark lonely strech of road.
Asthetically it looks better, I'm constantly getting inquiries and comments about the bumpers.
Hope this helps!